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Title

Some clues about the interphase reaction between ZnO and MnO2 oxides

AuthorsRubio Marcos, Fernando CSIC ORCID; Quesada, Adrián CSIC ORCID ; García García-Tuñón, Miguel Ángel ; Bañares, Miguel A.; García Fierro, José Luis CSIC ORCID; Martín-González, Marisol; Costa Krämer, José Luis CSIC ORCID ; Fernández Lozano, José Francisco CSIC ORCID
KeywordsZnO–MnO2 system
Binary oxides
Interphase diffusion
Raman spectroscopy
Magnetic properties
Issue DateMay-2009
PublisherElsevier
CitationJournal of Solid State Chemistry 182(5): 1211-1216 (2009)
AbstractRaman spectroscopy is used to evidence both the nature of the interphase reaction between ZnO and MnO2 particles and its kinetic evolution. Zn cations migrate from the ZnO grains during oxygen vacancies formation process and diffuse into the MnO2 particles leading to an interphase region with an intermediate valence Mn+3–O–Mn+4. Large amounts of desorbed Zn cations promote the formation of ZnMn2O4 structure, in addition to the intermediate valence state. The system evolves towards complete formation of the spinel phase at higher thermal treatment times. The reactivity of the ZnO plays an important role in the formation of this interphase. Low-reactivity ZnO powder, in which the oxygen vacancies are previously produced, shows a stabilization of the intermediate valence state with very limited formation of the spinel phase. A clear correlation between the amount of the intermediate state interphase and the magnetic properties has been established.
Description6 páginas, 8 figuras, 1 tabla.
Publisher version (URL)http://dx.doi.org/10.1016/j.jssc.2009.02.009
URIhttp://hdl.handle.net/10261/31210
DOI10.1016/j.jssc.2009.02.009
ISSN0022-4596
Appears in Collections:(ICMM) Artículos
(IMN-CNM) Artículos
(ICV) Artículos
(ICP) Artículos




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